Current state of DayZ

I haven't encountered anything horrible yet, the only bug I really notice is zombies walking through walls and stuff. That and my leg breaking for no reason whatsoever are the only things I've encountered.

i´ve only experienced some clipping bugs so far, and haven´t seen any hackers.
but after gearing up theres not much to do atm.

This game wont enter into Beta till the end of this year

I haven't seen any hackers, I'm not even sure if the game has any cheats made for it yet.
Bug wise, there are some bugs that you may find frustrating if you encounter them, however they appear quite rarely. For instance, recently when opening a door on the second floor, I was randomly teleported out of the building and fell to my death.

The game worth every single buck untill now, is progressing quite nice, but im still not able to play it smooth, i got a pc which should be able to run it at a smooth frame rate like 40-50 at high settings, but instead of that im playing it with everything on low except textures and the best fps i can reach is 30, they need some more optimization there, but the game is pretty fun and there are not that much bugs. As for hackers 0, i didnt saw anyone and i think theres no hacks for the game yet and i hope there will not be xD.

Haven't seen any hacker yet.
But, when I was at the second level of a building, a zombie from the floor below me broke my leg. And that sometimes happens without even knowing there is a zombie.
Overall, it's still worth it, unless you can't handle that and going to complain.

As a very big fan of DayZ mod, I'd say you should w8 for the implementation of vehicles, if you haven't bought the game already.

There ARE hackers on Day-Z standalone. I've witnessed it first hand.
It is quite buggy, and it's just the bare minimum right now in alpha. Updates are made to fix glitches and add things here and there but you will encounter quite a few frustrating things. Characters sometimes reset on their own, zombies glitch through houses/walls. I've even encountered "mike tyson" zombies that were able to kill me in one hit at full health fully geared. You'll break your legs out of nowhere and be unable to walk, glitch through walls and fall to your death and generally... just.. die... a lot..
But even with all the glitches, hackers, and general jerks.. it's a great game EVEN in alpha. As long as you don't take it too serious. It's my favorite game because of the interaction and at this point it's simple enough that you don't have to think too much. You meet interesting people, have a new adventure each day, finding new loot is always fun. With day-z, you never really know what you're going to get. Which is why I personally love it despite all the flaws in it's current state. Is it worth buying now? YES! It's $30 now and will go up after it's in beta + released etc, and it's a fun addicting game as is and tons of people play. You will never be bored.